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// Copyright (C) MongoDB, Inc. 2023-present.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
package credproviders
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"time"
"go.mongodb.org/mongo-driver/internal/aws/credentials"
)
const (
// ecsProviderName provides a name of ECS provider
ecsProviderName = "ECSProvider"
awsRelativeURI = "http://169.254.170.2/"
)
// An ECSProvider retrieves credentials from ECS metadata.
type ECSProvider struct {
AwsContainerCredentialsRelativeURIEnv EnvVar
httpClient *http.Client
expiration time.Time
// expiryWindow will allow the credentials to trigger refreshing prior to the credentials actually expiring.
// This is beneficial so expiring credentials do not cause request to fail unexpectedly due to exceptions.
//
// So a ExpiryWindow of 10s would cause calls to IsExpired() to return true
// 10 seconds before the credentials are actually expired.
expiryWindow time.Duration
}
// NewECSProvider returns a pointer to an ECS credential provider.
func NewECSProvider(httpClient *http.Client, expiryWindow time.Duration) *ECSProvider {
return &ECSProvider{
// AwsContainerCredentialsRelativeURIEnv is the environment variable for AWS_CONTAINER_CREDENTIALS_RELATIVE_URI
AwsContainerCredentialsRelativeURIEnv: EnvVar("AWS_CONTAINER_CREDENTIALS_RELATIVE_URI"),
httpClient: httpClient,
expiryWindow: expiryWindow,
}
}
// RetrieveWithContext retrieves the keys from the AWS service.
func (e *ECSProvider) RetrieveWithContext(ctx context.Context) (credentials.Value, error) {
const defaultHTTPTimeout = 10 * time.Second
v := credentials.Value{ProviderName: ecsProviderName}
relativeEcsURI := e.AwsContainerCredentialsRelativeURIEnv.Get()
if len(relativeEcsURI) == 0 {
return v, errors.New("AWS_CONTAINER_CREDENTIALS_RELATIVE_URI is missing")
}
fullURI := awsRelativeURI + relativeEcsURI
req, err := http.NewRequest(http.MethodGet, fullURI, nil)
if err != nil {
return v, err
}
req.Header.Set("Accept", "application/json")
ctx, cancel := context.WithTimeout(ctx, defaultHTTPTimeout)
defer cancel()
resp, err := e.httpClient.Do(req.WithContext(ctx))
if err != nil {
return v, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return v, fmt.Errorf("response failure: %s", resp.Status)
}
var ecsResp struct {
AccessKeyID string `json:"AccessKeyId"`
SecretAccessKey string `json:"SecretAccessKey"`
Token string `json:"Token"`
Expiration time.Time `json:"Expiration"`
}
err = json.NewDecoder(resp.Body).Decode(&ecsResp)
if err != nil {
return v, err
}
v.AccessKeyID = ecsResp.AccessKeyID
v.SecretAccessKey = ecsResp.SecretAccessKey
v.SessionToken = ecsResp.Token
if !v.HasKeys() {
return v, errors.New("failed to retrieve ECS keys")
}
e.expiration = ecsResp.Expiration.Add(-e.expiryWindow)
return v, nil
}
// Retrieve retrieves the keys from the AWS service.
func (e *ECSProvider) Retrieve() (credentials.Value, error) {
return e.RetrieveWithContext(context.Background())
}
// IsExpired returns true if the credentials are expired.
func (e *ECSProvider) IsExpired() bool {
return e.expiration.Before(time.Now())
}
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